Means for cutting toothed pinions, sprocket-wheels, or the like.



-No.'772,a41. PATEN'TBD OCT. 18, 1904.

' w. SMITH.

MEANS FOR CUTTING TOOTHBD PINIONS, SPROCKET WHEELS, OR THE LIKE.

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1%. 772,841. PATENTED OCT. 18, 1904.

v R. W. SMITH. I MEANS POR JUTTING TOOTHED PINIONS ROCKET WHEELS, OR THELIKE.

I APPLICATION mum 17, 1904.

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UNITED v STATES Patented October 18, 1904.

PATENT GFFICE.

MEANS FOR CUTTING TOOTHED PINIONS, S PROCKET-WHEELS, OR THE LIKE.

SPECIFICATION forming part of Letters Patent No. 772,841, dated October18, 1904. Application filed February 17, 1904. Serial No. 194,099. (Nomodel.)

land, have invented certain new and useful Improvements in Means forCutting Toothed Pinions, Sprocket-Wheels, or the Like, (for which I haveapplied ,fora patent in Great Britain, Patent No. 16,928, dated August4, 1903,) of which the'following is a specification.

This invention relates to improvements in the mode of and means forcutting toothed pinions, sprocket-wheels, and thelike, and has for itsobject a means whereby the whole of the'teeth of a-pinion or sprocketcan be cut at one process, thus very materially reducing the cost ofmanufacture of such articles and at the same time producinga pinion orsprocketwheel which is perfectly true in every respect.

In order that this invention may be clearly understood and more easilycarried into practice, I have appended'hereunto two sheets of drawings,upon which I have illustrated the nature of my said invention, togetherwith the mode of carrying the same into effect.

Figure 1 is an elevation of the blank from which the pinion is to beformed. Fig. 2 is an elevation of the pinion'complete after beingpassedthrough the tool. Fig. 3 is a longitudinal sectional elevationthrough the tool for cutting the pinions. Fig. 4 is a similarlongitudinal sectional elevation to that of Fig. 3, but showing theoperation-of cutting the pinion. Fig. 5 is a cross-section on the line 12, Fig. 3, but illustrating one of the hardened-steel rings of cutters,such as provided at or near the entrance end of the tool. f Fig. 6 is asimilar cross-section to Fig. 5, but on the line 3 4,-Fig. 3, andillustrating one of the hardened-steel ringsof cutters, which areprovided at or near the exit end of the tool.

Fig. 7 is a-longitudinal sectional elevation similar to Fig. 3 andillustrating a means for In carrying this invention into effect the toolconsists of a ser es of h ardened-steel rings 'A contained within a tubeor casing B, which is provided with the flange or shoulder C at the oneend, against which flange or shoulder the end ring A butts, while thewhole of the rings A are preferably retained in the casing by thescrew-cap E. The internal circumferences of all "of the steel rings areshaped toform the projecting cutters F, which correspond in number tothe numbers of spaces between the teeth required in the sprocket orpinion to be cut, while the diameter of thering between the cuttingedges F, as also the shape of such cutting edges, are varied in eachring, commencing with shallow and broad cutters F, with the largerdiameter of,

the ring of cutting edges similar to those illustratedin Fig. 5, andgraduating in the intermediate rings so as to finish with cutters suchasillustrated by Fig. 6, which are shaped as required to finish the sidesof the teeth and which project suflicie'ntly from the rings 'to completethe cutting of the spaces between the teeth H of the pinion.

Akey J is fixed longitudinally in the tube or casing B, while each ofthe rings is slotted at K, so as to fit the key, and thus insure theperfect alinement of the cutters.

In the process of cutting the teeth the tool is preferably fixed on thebed M of a machine,

while the blank N is forced straight through the rings of cutters, suchforcing action being effected by the one end of a reciprocating rod P,the otherend of which may be mounted upon a traveling carriage, actuatedby a screw in the case of the smaller pinions orby hydraulic pressure inthe case of the larger class of. toothed wheels.

A portion of the rings may be cut away or recessed on the lower sidesintermediately between the cutters, as illustrated, by Figs. 7 and 8,and a corresponding slot T provided in the under side of the casing B ina position linable with the recesses to permit of the cuttings droppingthrough.

Having now described my invention, what I claim as new, and desire tosecure by Letters initial to the finishing rings and a discharge-Patent, is outlet for each ring. 10 In a means for cutting toothedpinions, In Witness whereof I have hereunto set my sprocket-Wheels andthe like the combination hand in the presence of two witnesses.

5 of a tubular casing, a plurality of annular ROBERT \VALKER SMl'lll.

cutting-rings contained therein, and graduated \Vitnesses: aliningcutters for the internal faces of the TALTER H. E. BARILAM,

cutting-rings arranged successively from the J USTUS J ONES.

